Water-insoluble azo dyestuffs



Patented July 30, 1940 WATER-INSOLUBLE AZOi DY:EST;UFFS

Gerhard Schrader, Elberfeld I./G.'-Werk, and Otto Bayer, Leverkusen I. G. Wei-k, Germany, assignors to General Aniline & .Film Corporation, a corporation of Delaware No Drawing Application ay 11 1938; Serial No. 207,304. In Germany May 22, 1937 fi qlai'ms (01260-204) The present invention relates to new water-insoluble azo dyestufis, to a method of preparing the same and to fibers dyed with the said dyestufls; more particularly it relates to azo dyestufis.

5 of the general formula cal free from Water-solubilizing groups,X stands for a sulfonamide group, the hydrogen atoms of which may be substituted, Y and Z may stand or halogen. 1

'Our new dyestuffs may lee-produced either in substance or on the fiber and are obtained by coupling diazo compounds-of aromatic bases of the general formula IIIH:

wherein X, Y and Z mean the same as stated above, with arylamides of c-hydroxynaphthoic acid. The diazo compounds may also be employed in the form of diazoamino compounds whereby the diazo compound capable of coupling is regenerated on the fiber in the course of the reaction.

"The aromatic bases used in the described proc- In this formula R stands for an aromatic radifor thesame or different radicals'and' mean alkyl obtained with the following ess as diazo, components can be obtained as follows: the sulfonic acids of the formula r v I NH:

( Z andY meaningthe same'a afibveyare converted into the acid chloride by treatment with chlorosulfonic acid and the acid chlorides thus obtained are caused in the usual waylto react with ammonia or aliphatic bases to form the; sulfonamides. Also the sulfonic acids of the men tioned type, which contain instead of the'aminogroup the nitro-group, may be used;-in this case,

after the formation of the sulfonamide, the nitro group is reduced in the usual way to the aminoazo dyestuffs yield red to orange.

group..l:

The new shades and are distinguished by a remarkably good iastness to light and weather.

Example Well scoured and dried cotton yarn is impregnated with a; solution'containing 3.2 g. of 2-naphthol-3-carboxylic' acid ,e-nap'hthyl-amide, 6 cos. of sodium hydroxide solution (36." B.) and 6 cos. of Turkey red oil per litre, wrung; out' -and, without drying, developed in a diazoisolu'tion which contains 2.6 ,g. of 1.g dimethyl-l-sulfo-dimethy1- amide-5-aminobenzene (melting-point 122 C.) per litre, and is neutralized with sodium acetate, rinsed and scoped, a yellowish scarlet is obtained of ;veryffood' ,fastness to light and weather. I I I I In a similar way dyestufis, or dyed fibers are components; g I

Base Coupling component Shade OH 01 i Yellowish red. SOzN(CHa)2 CO.NH OCH! (Melting-point 151 0. i 59; on NB! 0H )0111;

CH SOgN(O2Hs)z com: 01 Do.-

(Melting point 122 C.) OCH: 55

OH OCH! Do. Do CO.NH

bases and coupling Base Coupling component Shade o1 NH, OH

01 S0 .N(CH;)= o 0.NH oH3 Reddish orange.

(Melting point 141 O.)

Do C O.NH- Yellowish red.

or: NH: OH CH3 01 s 02N(C2H5)2 c o .NHQOI Orange. (Melting point 107 0.) 0H1 OH c0113 D0 o ONEQO OH; Yellowish red.

01 NH: OH

CH3- SOZ.N(CH3)2 0 ONE Yellowish scarlet.

(Melting point 134135 C.)

All these dyeings are distinguished ness to light and Weather.

We claim:

by good fast- 1. Water-insoluble azo dyestufis of the general formula COHN wherein Y and Z stand for radicals of the group consisting of alkyl and halogen, yielding, when produced on the fiber, red to orange shades of remarkably good fastness to light and weather.

2. The water-insoluble azo dyestufi of the formula SO2.N(CH3)a yielding, when produced on the fiber, yellowish scarlet shades of very good fastness to light and weather.

3. The water-insoluble azo dyestufi of the formula SlOz.N(CHa)2 GERHARD SCHRADER. OTTO BAYER. 

